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  <title>Document</title>
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  <script>
    let str = '123'
    console.log(Number(str));
    // 转型
    console.log(parseInt('12px'));
    console.log(parseInt('12.34px'));
    console.log(parseInt('12.95px'));
    // 浮点型
    console.log(parseFloat('12px'));
    console.log(parseFloat('12.34px'));
    console.log(parseFloat('12.95px'));



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